KR101670847B1 - Apparatus and method for peripheral image generation of vehicle - Google Patents

Abstract

An apparatus and method for creating a peripheral image of a vehicle for acquiring an image of the rear of a vehicle and displaying the image on a monitor is disclosed. The vehicle periphery image generating apparatus according to the present invention generates a bird's-eye image by converting a camera section, which is located in a vehicle and generates a photographed image by photographing the periphery of the vehicle, into data of a ground coordinate system projected to a visual point A bird's-eye view image generating unit, a movement information extracting unit for extracting movement information of the vehicle based on wheel pulses for a left wheel and a right wheel of the vehicle, which are generated through a wheel pulse sensor located in the vehicle, A moving area bird's eye view image generating unit for generating a moving bird's eye view image, which is a bird's-eye view of the area where the vehicle has moved, by associating the generated previous bird's-eye view image with the movement information; The bird's-eye image is summed with the moving- And a synthesized bird's-eye view image generating unit for generating a synthesized bird's-eye view image.

Description

[0001] APPARATUS AND METHOD FOR PERIPHERAL IMAGE GENERATION OF VEHICLE [0002]

The present invention relates to an apparatus and a method for generating a vehicle periphery image. And more particularly, to an apparatus and method for generating a peripheral image of a vehicle for acquiring an image of the rear of the vehicle and displaying the image on a monitor.

2. Description of the Related Art Generally, a vehicle is a device that drives a motor vehicle such as an engine installed in a vehicle body to drive a road or the like and carries a person or a freight or perform various operations. A driver of the vehicle safely drives the vehicle while observing the driving direction .

However, when the vehicle is parked, the driver of the vehicle is hard to watch the running direction, which is the rear of the vehicle. Therefore, as a device for displaying the rear side of a vehicle, there is known a display device that outputs an image from a camera installed behind the vehicle to the monitor as it is.

In particular, Korean Patent Laid-Open Publication No. 2008-0024772 discloses a technology for clearly grasping a relative position between a vehicle and a parking space in an image displayed on a monitor through a technique of converting an input image received from a camera into a bird's-eye view have.

However, the technique described above has a limitation in that an object that does not exist in the current field of view of the camera can not be displayed. For example, when backing up for parking of a vehicle, there is a problem that a parking line (outside the current sight) existing in the space where the vehicle has already passed can not be displayed.

Therefore, there is a need for a technique that can generate an image for displaying an object outside the current view of the camera. In addition, when adopting such a technology, it is necessary to minimize the system load, but to find a direction that can support an accurate and fast operation speed.

It is an object of the present invention to enable the display of objects outside the current view of the camera by matching the bird's-eye view of the images around the vehicle photographed at different times through the camera.

It is another object of the present invention to provide a method and system for preventing system overload and more accurately matching a bird's eye view of images around a vehicle photographed at different times through a camera, It is possible.

It is another object of the present invention to provide a steering system for a vehicle, which avoids system overload by using a wheel pulse sensor and a steering wheel sensor, both of which are located in a vehicle, in matching a bird's eye view of images around a vehicle photographed at different times through a camera It is possible to match exactly.

According to an aspect of the present invention, there is provided an apparatus for generating a peripheral image of a vehicle, the apparatus comprising: a controller for converting a captured image generated by a camera unit located in a vehicle and photographing the periphery into data of a ground coordinate system projected to a visual point, A wheel speed sensor for generating an image based on a wheel pulse for the left wheel and a right wheel of the vehicle generated corresponding to the wheel rotation amount of the vehicle through a wheel pulse sensor located in the vehicle, Generating a moving area bird's eye view image that generates a moving area bird's eye view image that is a bird's-eye view of the area in which the vehicle has moved by associating the previous bird's-eye view image generated by the bird's-eye image generator with the movement information; And after the previous bird's-eye image is generated And a bird's-eye view after the generated image, generate a bird's eye view image synthesis unit for synthesizing bird's eye view image and the moving region.

In this case, the movement information extracting unit may include a movement distance extracting unit that extracts the movement distance of the vehicle based on the wheel pulses for the left wheel and the average of the wheel pulses for the right wheel.

In this case, the movement information extracting unit may include a pulse-based turning radius extracting unit for extracting a turning radius of the vehicle based on a difference between wheel pulses of the left wheel and the right wheel.

At this time, the movement information extracting unit extracts a pulse-based movement position extracting unit that extracts a position where the vehicle is moved, based on the turning radius extracted from the pulse-based turning radius extracting unit and the moving distance extracted from the moving distance extracting unit Section.

At this time, the movement information extracting unit senses a steering rotation angle of the vehicle through a steering wheel sensor located in the vehicle, and calculates a rotation angle of each of a left front wheel and a right front wheel of the vehicle based on the steering rotation angle And a steering-based turning radius extracting unit for extracting a turning radius of the vehicle.

At this time, the movement information extracting unit extracts a steering-based movement position extracting unit that extracts a position where the vehicle is moved, based on the turning radius extracted from the steering-based turning radius extracting unit and the moving distance extracted from the moving distance extracting unit Section.

At this time, the movement information extracting unit may include a gear-based extracting command unit for checking the gear state of the vehicle and controlling to extract movement information of the vehicle when the vehicle is in a reverse state.

At this time, the gear base extracting command unit may analyze the pattern change of the wheel pulse to the left wheel and the right wheel in the case where the gear state of the vehicle is neutral, and extract the change of the traveling direction of the vehicle have.

At this time, the change of the traveling direction of the vehicle can be extracted by analyzing the change of the pattern of the rising edge or the falling edge of the repeated wheel pulses between the left wheel and the right wheel.

According to another aspect of the present invention,

Generating a previous bird's-eye view image by converting a shot image generated by a camera section located in a vehicle and photographing the surroundings into data of a ground coordinate system projected to a visual point by a bird's-eye view image generating section, Extracting movement information of the vehicle based on wheel pulses for the left and right wheels of the vehicle, the wheel pulses being generated corresponding to the wheel rotation amount of the vehicle through a wheel pulse sensor located in the vehicle, Generating a moving area bird's eye view image, which is a bird's-eye view of the area in which the vehicle has moved, by associating the previous bird's-eye view image with the movement information by a moving-area bird's-eye view image generating unit; After the bird's-eye image is created and generated after the image is created, And a step of generating a composite bird's eye view image by the image, and the synthesized bird's-eye view image of the moving area.

In this case, the step of extracting the movement information may include extracting a moving distance of the vehicle based on an average of the wheel pulses for the left wheel and the wheel pulses for the right wheel.

At this time, the step of extracting the movement information may include extracting a turning radius of the vehicle based on a difference of wheel pulses between the left wheel and the right wheel.

At this time, the step of extracting the movement information may include extracting a position where the vehicle is moved based on the turning radius extracted at the step of extracting the turning radius and the traveling distance extracted at the step of extracting the traveling distance Step < / RTI >

At this time, the step of extracting the movement information may include sensing a steering rotation angle of the vehicle through a steering wheel sensor located on the vehicle, and calculating a rotation angle of each of the left front wheel and the right front wheel of the vehicle based on the steering rotation angle And extracting a turning radius of the vehicle by calculating an angle.

At this time, the step of extracting the movement information may include extracting a position where the vehicle is moved based on the turning radius extracted at the step of extracting the turning radius and the traveling distance extracted at the step of extracting the traveling distance Step < / RTI >

In this case, after the step of generating the previous bird's-eye view image, the step of checking the gear state of the vehicle may further include a step of controlling to extract the movement information of the vehicle when the vehicle is in the reverse state.

At this time, when the gear state of the vehicle is neutral, the pattern change of the wheel pulse with respect to the left wheel and the right wheel can be analyzed to extract a change in the traveling direction of the vehicle.

At this time, the change of the traveling direction of the vehicle can be extracted by analyzing the change of the pattern of the rising edge or the falling edge of the repeated wheel pulses between the left wheel and the right wheel.

According to the present invention, it is possible to display an object outside the current view of the camera by matching the bird's-eye view of the images around the vehicle photographed at different times through the camera.

In addition, according to the present invention, in matching the bird's-eye view of the images around the vehicle photographed at different times through the camera, the system overload can be prevented and more precise registration can be achieved by utilizing the wheel pulse sensor located in the vehicle .

In addition, according to the present invention, in matching the bird's eye view of the images around the vehicle photographed at different times through the camera, it is possible to prevent the system overload by using the wheel pulse sensor and the steering wheel sensor, Can be matched.

1 is a schematic view showing a main part of a vehicle periphery image generating apparatus according to the present invention.
2 is a block diagram of an apparatus for generating a peripheral image of a vehicle according to the present invention.
3 is a diagram illustrating a positional relationship in coordinate transformation performed by the apparatus for generating a peripheral image of a vehicle according to the present invention.
4 is a diagram for explaining a concept of a vehicle periphery image generating apparatus according to the present invention.
5 to 10 are diagrams showing a processing procedure performed by the vehicle periphery image generating apparatus according to the present invention.
11 is a first embodiment of a movement information extracting unit which is a component of an apparatus for generating a peripheral image of a vehicle according to the present invention.
12 is a view showing wheel pulses for the left rear wheel of a vehicle generated by the vehicle periphery image generating apparatus according to the present invention.
13 is a diagram showing wheel pulses for the right rear wheel of a vehicle generated by the vehicle periphery image generating apparatus according to the present invention.
FIG. 14 is a diagram for explaining a method of extracting a moving position of a vehicle according to the first embodiment of the movement information extracting unit. FIG.
15 is a second embodiment of a movement information extracting unit which is a component of a vehicle periphery image generating apparatus according to the present invention.
16 is a view for explaining a steering wheel sensor of a vehicle according to a second embodiment of the movement information extracting unit.
17 is a diagram for explaining a method of calculating the rotation angles of the left front wheel and the right front wheel of the vehicle according to the second embodiment of the movement information extracting unit.
FIG. 18 is a diagram for explaining a method of extracting a moving position of the vehicle according to the second embodiment of the movement information extracting unit. FIG.
19 is a diagram for explaining a method of extracting a change in the traveling direction of the vehicle by analyzing the pattern change of the wheel pulse with respect to the rear wheel of the vehicle.
20 is a view for explaining a method of extracting a change in the traveling direction of the vehicle by analyzing the pattern change of the wheel pulse with respect to the rear wheel of the vehicle.
21 is a flowchart of a method of generating a vehicle periphery image according to the present invention.
FIG. 22 is a view for explaining a step of instructing to extract movement information of a vehicle in the vehicle periphery image generating method according to the present invention.

The present invention will now be described in detail with reference to the accompanying drawings. Hereinafter, a repeated description, a known function that may obscure the gist of the present invention, and a detailed description of the configuration will be omitted.

Embodiments of the present invention are provided to more fully describe the present invention to those skilled in the art. Accordingly, the shape and size of the elements in the drawings and the like can be exaggerated for clarity.

The basic system configuration of the vehicle periphery image generating apparatus according to the present invention will be described with reference to Figs. 1 and 2. Fig.

1 is a schematic view showing a main part of a vehicle periphery image generating apparatus according to the present invention. 2 is a block diagram of an apparatus for generating a peripheral image of a vehicle according to the present invention.

1, an apparatus 100 for generating a peripheral image for a vehicle according to the present invention includes a camera unit 110 for generating a captured image by photographing a periphery 5 located in a vehicle 1, A bird's-eye view image generating unit 120 for generating a bird's-eye view image by converting the camera unit 110 into data of a ground coordinate system projected to a visual point, A movement information extracting unit 130 for extracting movement information of the vehicle on the basis of wheel pulses for the left wheel 3 and the right wheel (not shown) of the vehicle, Area bird's eye view image that generates a moving area bird's eye view image that is a bird's-eye view of an area where the vehicle 1 has moved by corresponding to the movement information, Section 140, and a synthesized bird's-eye view image creation unit 150 for a subsequent bird's eye view image is generated up to the previous after the bird's eye view image is generated, and the synthesized bird's-eye view image of the moving area.

The display unit 160 may further include a display unit 160, which is located in the vehicle 1, and displays the synthesized bird's-eye view image.

In this case, the bird's-eye view image generating unit 120, the movement information extracting unit 130, the moving area bird's eye view image generating unit 140, ), Which is an electronic device for performing processing of image data, including a microcomputer as a main part of the camera unit 1, and can be configured integrally with the camera unit 1. [

The camera unit 110 is located in the vehicle 1 and photographs the periphery 5 to generate a photographed image.

As shown in FIG. 1, the camera unit 110 is installed at the rear of the vehicle 1 and includes at least one camera (for example, a CCD camera).

The bird's-eye view image generating unit 120 generates a bird's-eye view image by converting the shot image captured and generated by the camera unit 110 into data of a ground coordinate system projected by the camera unit 110 as a visual point .

As a method of converting a captured image generated by the camera unit 110 into a bird's-eye image, a related art may be used as described later. Here, by performing the inverse processing of the normal perspective conversion, the position of the image on the ground (for example, parking space indication) is obtained as the bird's-eye image.

3 is a diagram illustrating a positional relationship in coordinate transformation performed by the apparatus for generating a peripheral image of a vehicle according to the present invention.

Specifically, as shown in FIG. 3, the perspective transformation is performed in such a manner that the position data of the image on the ground is projected from the position R of the camera portion 110 onto the screen plane T having the focal length f .

)로 지면(x-y 좌표 평면)상에 이미지를 모니터링한다고 가정하자. 따라서 여기서는 아래의 수학식 1에 나타난 바와 같이, 스크린 평면(T)상에 2-차원 좌표(α,β)가 지면 평면상의 좌표(조감도 좌표)로 변환(역투시 변환)될 수 있다.More specifically, the camera unit 110 is positioned at the point R (0, 0, H) on the Z-axis,

) To monitor the image on the ground (xy coordinate plane). Therefore, the two-dimensional coordinates (?,?) On the screen plane (T) can be transformed into coordinates (bird's-eye degree coordinate) on the ground plane (inversed transformation) as shown in the following equation (1).

That is, by using Equation (1), the projected image can be converted into an image for the screen of the display unit 160 (showing a bird's-eye view image) and displayed on the display unit 160.

Hereinafter, the concept of the vehicle periphery image generating apparatus according to the present invention will be described with reference to FIG.

Referring to FIG. 4, the vehicle 1 at time T and the vehicle 1 'at time T + 1 after a predetermined time at time T are shown.

The bird's-eye image generated at the vehicle 1 at the time T is referred to as a previous bird's-eye view image 15 and the bird's-eye view image generated at the vehicle 1 'at the time T + 1 is referred to as a bird's-eye view image 25 .

At this time, the bird's-eye view image 35 for the common area exists between the previous bird's-eye view image 15 and the bird's-eye view image 25 thereafter. That is, it is the bird's-eye image generated and generated commonly at the T-point and the T + 1-point.

The portion of the previous bird's-eye view image 15 except for the bird's-eye view image 35 for the common area, as viewed from the side of the vehicle 1 'at the time point T + 1, .

The past bird's eye view image 45 is an object outside the view of the camera unit 110 behind the vehicle 1 'at the time point T + 1. That is, it means an object that is not shot at the current time point T + 1.

The apparatus 100 for generating a vehicle periphery image according to the present invention may include the past bird's eye image 45 in an image displayed by the display unit 160 inside the vehicle 1 ' The purpose. That is, the image of the bird's-eye view 25 existing in the current field of view of the camera unit 110 and the bird's-eye view image 45 of the past are synthesized and displayed.

The synthesized image is referred to as a composite bird's-eye view image. In order to generate a composite bird's-eye view image, the bird's-eye view image 25 and the past bird's eye view image 45 are accurately synthesized, It is necessary.

Further, in order to accurately extract the previous bird's-eye view image 45, movement information of the vehicle should be extracted. The previous bird's-eye view image 45 is calculated by extracting the movement information, and thus is referred to as a moving-region bird's-eye view image. A concrete method of extracting the movement information of the vehicle will be described later.

Therefore, the synthesized bird's-eye view image is generated by photographing at the T-point and generating the previous bird's-eye view image 15, and then capturing the bird's-eye image 25 at the (T + 1) It is an image.

Hereinafter, the operation of the movement information extracting unit 130, the moving area bird's eye view image generating unit 140, and the synthesized bird's-eye view image generating unit 150 will be described with reference to FIG. 5 to FIG.

5 to 10 are diagrams showing a processing procedure performed by the vehicle periphery image generating apparatus according to the present invention.

FIG. 5 shows an image captured and generated by the camera unit 110 displayed on the display unit 160. FIG. 6 shows an image captured by the bird's-eye image generating unit 120, A bird's-eye view image 10 (hereinafter referred to as a previous bird's-eye view image) is generated and displayed on the display unit 160.

Referring to FIG. 5, it can be seen that the bicycle 11 and the parking line 12 are present behind the vehicle 1. Referring to FIG. 6, the bicycle 11 and the parking line 12 also have a bird's- Image is converted into an image.

6 shows the actual rectangular parking space display because the camera unit 110 is located at the upper part of the rear of the vehicle 1. The actual rectangular parking space display is the distance between the vehicle 1 and the position of the camera space 110 and the parking space display line The display is distorted according to the distance or the like.

6, it can be confirmed that a bird's eye image is not generated for the object 20 outside the current view of the camera unit 110. [

Accordingly, since the driver can not confirm the parking line or the object outside the current sight of the camera unit 110 in the parking operation, it is difficult to intuitively recognize the position of the vehicle 1, and there is a problem that a contact accident may be caused .

In order to solve such a problem, an apparatus 100 for generating a vehicle periphery image according to the present invention discloses a technique for generating a bird's-eye image for an object 20 outside the current sight of the camera unit 110. [

7 shows that the driver of the vehicle 1 rotates the steering wheel 4 of the vehicle 1 in the counterclockwise direction to move the vehicle 1 from the space shown in Fig. 110).

FIG. 8 shows a bird's-eye image 30 (hereinafter referred to as a bird's-eye view image) generated by converting the bird's-eye image shown in FIG. 7 by the bird's-eye image generator 120.

At this time, the portion of the previous bird's-eye view image 10 may be included in the bird's-eye view image 30 in accordance with the moving distance of the vehicle 1.

Also, in FIG. 8, a bird's-eye view image 40 not shown in FIG. 7 exists. 7, the bird's-eye view image 40 refers to a bird's-eye view image of an object that is not present in the current view of the camera unit 110 located in the vehicle. Referring to FIGS. 7 and 8, ) Corresponds to an object which is not present in the current field of view of the camera unit 110.

At this time, the bird's-eye view image 40 not shown in FIG. 7 becomes a virtual image, and since the bird's-eye image 40 is a part of the previous bird's-eye view image 10 before the vehicle 1 has been backward , An object not in the current view of the camera unit 110 can be displayed.

However, there is a portion 50 in which the bird's-eye image is not generated because the vehicle 1 has not existed in the previous state before the vehicle 1 is backward, that is, in the previous bird's-eye view image. Specifically, the image prior to the starting point of operation of the vehicle 1 is not captured.

As a result, the driver can view the bird's-eye image 30 and the bird's-eye image 40 not shown in FIG. 7 together through the display unit 160.

Accordingly, the driver can confirm the bicycle 41 and the parking line 42 that are present outside the field of view of the camera unit 110 at the time of backward movement, thereby preventing a contact accident in advance.

At this time, the bird's-eye view image obtained by combining the bird's-eye view image 30 and the bird's-eye view image 40 not shown in FIG. 7 will be referred to as a composite bird's-eye view image.

However, in order to generate such a composite bird's-eye view image, it is necessary to extract a past image as the bird's-eye image 40 (not shown in FIG. 7).

If the movement information extracting unit 130 extracts the movement information of the vehicle, a detailed method will be described later.

9 is an image taken by the camera unit 110 taken by the vehicle 1 when the vehicle 1 is moved backward by a certain distance from the space shown in Fig.

10 shows a bird's-eye view image 50 (hereinafter referred to as a last bird's-eye view image) generated by converting the bird's-eye image shown in FIG. 9 by the bird's-eye view image generating unit 120.

Depending on the moving distance of the vehicle 1, the last bird's-eye view image 50 may include portions existing in the previous bird's-eye view image 10 and the bird's-eye view image 30 thereafter.

Also, in FIG. 10, a bird's-eye view image 60 not shown in FIG. 9 is also present. In this case, the bird's-eye view image 60 not shown in FIG. 9 means a bird's-eye view image for an object that is not present in the current view of the camera unit 110 located in the vehicle.

The bird's-eye view image 60 not shown in FIG. 9 is a virtual image. The bird's-eye view image 60 shown in FIG. 9 has a state before the vehicle 1 is backward, It is possible to display an object that is not present in the current view of the camera unit 110. [

Therefore, the driver can view the final bird's-eye view image 50 and the bird's-eye view image 60 not shown in FIG. 9 together via the display unit 160.

As a result, the driver can check the parking line 61 existing outside the field of view of the camera unit 110 at the time of backward movement, thereby preventing a contact accident in advance.

At this time, the bird's-eye view image obtained by synthesizing the bird's-eye view image 60 not shown in FIG. 9 and the last bird's-eye view image 50 is referred to as a composite bird's-eye view image.

However, in order to generate such a composite bird's-eye view image, it is necessary to extract a past image that is a bird's-eye image 60 (not shown in FIG. 9).

If the movement information extracting unit 130 extracts the movement information of the vehicle, a detailed method will be described later.

Hereinafter, the function of the movement information extracting unit 130, which is a component of the apparatus 100 for generating a peripheral image of a vehicle according to the present invention, will be described, and various embodiments of the movement information extracting unit 130, Two examples will be described in detail.

The movement information extracting unit 130 extracts the movement information from the left wheel 3 and the right wheel of the vehicle 1 generated corresponding to the amount of wheel rotation of the vehicle through the wheel pulse sensor located in the vehicle 1 ) Of the vehicle 1 based on the wheel pulse of the vehicle 1.

The front wheel 2 of the vehicle 1 is configured to rotate differently from the rear wheel of the vehicle 1. In order to accurately extract the moving distance of the vehicle 1, It is more effective to utilize.

Therefore, in describing the movement information extracting unit 130, the description will be focused on the rear wheel. However, this description does not limit the rear wheel only to the right range in the movement information extracting unit 130. [

In addition, there is a technique of employing a conventional yaw rate sensor and a vehicle speed sensor in extracting movement information of the vehicle 1. However, in this prior art, as in the embodiment of the present invention, There is a limitation in extracting accurate movement information of the vehicle 1 when the vehicle 1 is moving at a low speed, such as when the vehicle 1 is parked or moved backward.

Therefore, the present invention can be applied to a wheel (3) and a right wheel (not shown) of the vehicle (1) generated corresponding to the amount of wheel rotation of the vehicle through a wheel pulse sensor located in the vehicle A technique for extracting movement information of the vehicle (1) based on a pulse is disclosed.

11 is a first embodiment of a movement information extracting unit which is a component of an apparatus for generating a peripheral image of a vehicle according to the present invention. 15 is a second embodiment of a movement information extracting unit which is a component of a vehicle periphery image generating apparatus according to the present invention.

11, the movement information extraction unit 130 according to the first embodiment includes a movement distance extraction unit 131, a pulse-based rotation radius extraction unit 132a, and a pulse-based movement position extraction unit 133a do.

15, the movement information extracting unit 130 according to the second embodiment includes a movement distance extracting unit 131, a steering-based turning radius extracting unit 132b, and a steering-based movement position extracting unit 133b do.

The movement distance extraction unit 131 common to the first and second embodiments of the movement information extraction unit 130 will be described first and the first embodiment and the second embodiment will be described in detail below .

1. Travel distance The extraction unit (131)

The moving distance extracting unit 131 extracts the moving distance of the vehicle based on the wheel pulses for the left wheel generated through the wheel pulse sensors located in the vehicle 1 and the average of the wheel pulses for the right wheel. .

The wheel pulse sensor is located in the vehicle 1 and generates a wheel pulse signal according to the movement of the left wheel and the right wheel of the vehicle 1. [

12 is a view showing wheel pulses for the left rear wheel of a vehicle generated by the vehicle periphery image generating apparatus according to the present invention. 13 is a diagram showing wheel pulses for the right rear wheel of a vehicle generated by the vehicle periphery image generating apparatus according to the present invention.

Referring to FIG. 12, the wheel pulse signal for the left rear wheel of the vehicle 1 can be checked according to the change of time. At this time, the wheel pulse signal is counted by 1 every cycle, and the distance moved per cycle is 0.0217m.

Likewise, referring to Fig. 13, the wheel pulse signal for the right rear wheel of the vehicle 1 can be confirmed according to the change of time. At this time, the wheel pulse signal is counted by 1 every cycle, and the distance moved per cycle is 0.0217m.

12 and 13 together, the wheel pulse signal for the left rear wheel at the time T is counted three times in the cycle 3 and has the value of the count 3, but the wheel pulse signal for the right rear wheel at the time T is five times The period is counted and has a value of count 5.

That is, it can be seen that the distance traveled during the same time is larger in the right rear wheel. It can be judged that the steering wheel is rotated backward in the clockwise direction on the premise that the vehicle 1 moves backward. A specific method for determining the backward and forward of the vehicle will be described later.

It is possible to extract the moving distance of the vehicle based on the wheel pulses for the left rear wheel and the right rear wheel shown in FIGS. 12 and 13 by using the following Equations (2) to (4).

In Equation (2), K1 denotes the moving distance of the inner rear wheel. For example, when the vehicle 1 moves backward with the steering wheel rotated in the clockwise direction, the right rear wheel becomes the inner rear wheel, and when the vehicle 1 moves backward with the steering wheel rotated counterclockwise The left rear wheel becomes the inner rear wheel.

WP _out represents the wheel pulse count value of the outer rear wheel, and WP _res represents the moving distance (0.0217 m) per one cycle signal as the resolution of the wheel pulse signal. That is, WP _res is a constant (0.0217), which is a value that can be changed according to the type and setting of the wheel pulse sensor.

Also, t means time, means before the vehicle moves, and? T means the time taken while the vehicle is moving.

In Equation (3), K2 denotes the moving distance of the outer rear wheel.

For example, when the vehicle 1 moves backward with the steering wheel rotated in the clockwise direction, the left rear wheel becomes the outer rear wheel, and when the vehicle 1 moves backward with the steering wheel rotated counterclockwise The right rear wheel becomes the outer rear wheel.

WP _out represents the wheel pulse count value of the outer rear wheel, and WP _res represents the moving distance (0.0217 m) per one cycle signal as the resolution of the wheel pulse signal. That is, WP _res is a constant (0.0217), which is a value that can be changed according to the type and setting of the wheel pulse sensor.

Also, t means time, means before the vehicle moves, and? T means the time taken while the vehicle is moving.

In Equation (4), K denotes a moving distance of the axle. Here, the moving distance of the axle is the same as the moving distance of the vehicle.

K1 denotes a moving distance of the inner rear wheel, and K2 denotes a moving distance of the outer rear wheel. That is, the moving distance of the axle, which is the moving distance of the vehicle, is an average value of the moving distance of the rear wheel inside the vehicle and the moving distance of the rear wheel outside the vehicle.

Therefore, the travel distance extracting unit 131 can extract the travel distance of the vehicle 1 through Equations (2) to (4).

2. First Example

A description will be given of a method of extracting the turn radius and the moved position coordinates of the vehicle 1 according to the first embodiment by utilizing the moving distance of the vehicle 1 extracted from the moving distance extracting unit 131 .

FIG. 14 is a diagram for explaining a method of extracting a moving position of a vehicle according to the first embodiment of the movement information extracting unit. FIG.

Referring to FIG. 14, the current position 6 of the vehicle 1 is halfway between the left rear wheel and the right rear wheel, which is the same as the current center position of the axle. In addition, it can be seen that the position 7 after the vehicle 1 has moved is between the left rear wheel and the right rear wheel of the vehicle at the shifted position.

The pulse-based turning radius extracting unit 132a extracts the turning radius of the vehicle based on the difference between the wheel pulses of the left rear wheel and the right rear wheel. As a method of extracting the turning radius, the following equations (5) to (8) are used.

In Equation (5), K1 denotes the moving distance of the inner rear wheel, and R denotes the turning radius of the vehicle. Specifically, it means the turning radius of the axle.

는, t 시간 동안의 차량 각도의 변화량을 의미한다.W means the width of the vehicle. Specifically, the distance between the left rear wheel and the right rear wheel. Also,

Means a change amount of the vehicle angle during the time t.

In Equation (6), K2 denotes the moving distance of the outer rear wheel, and R denotes the turning radius of the vehicle. Specifically, it means the turning radius of the axle.

는, t 시간 동안의 차량 각도의 변화량을 의미한다.In addition, W means the width of the vehicle,

Means a change amount of the vehicle angle during the time t.

는, t 시간 동안의 차량 각도의 변화량을 의미한다.In Equation (7), K2 denotes the moving distance of the outer rear wheel, and K1 denotes the moving distance of the inner rear wheel. In addition, W means the width of the vehicle,

Means a change amount of the vehicle angle during the time t.

에 관하여 정리한 수학식이다. Equation (8) is obtained by substituting Equation (7) into the change amount of the vehicle angle during the time t

Is a mathematical expression summarized with respect to.

를 구할 수 있게 된다. That is, if the value obtained by subtracting K1 obtained from Equation (6) from K2 obtained from Equation (5) is divided by W, which is the predetermined width of the vehicle,

.

및 W 값을 모두 알 수 있게 되었으므로, 상기 수학식 5 또는 수학식 6에 대입하게 되면 차량의 회전 반경인 R 값을 구할 수 있게 된다.
Therefore, K1, K2,

And W values, it is possible to obtain the R value of the turning radius of the vehicle by substituting into Equation (5) or (6).

Based on the turning radius extracted from the pulse-based turning radius extracting unit 132a and the moving distance extracted from the moving distance extracting unit 131, the pulse-based moving position extracting unit 133a extracts the pulse- And extracts the location. As a method of extracting the turning radius, the following equations (9) to (17) are used.

(t)는, 현재 차량의 각도를 의미한다.In Equation (9), x _c (t) denotes the position of the x-coordinate of the center of rotation, and x (t) denotes the position of the x-coordinate of the current center position of the axle, which is the current position of the vehicle. The present center position of the axle is a halfway between the left rear wheel and the right rear wheel. Also,

(t) means the current vehicle angle.

(t)는, 현재 차량의 각도를 의미한다.In Equation (10), y _c (t) denotes the position of the y coordinate of the rotation center, and y (t) denotes the position of the x coordinate of the current center position of the axle, which is the current position of the vehicle. Also,

(t) means the current vehicle angle.

는, 회전 중심을 원점으로 하였을 때의 차축의 현재 중심 위치 중 x 좌표의 위치를 의미하고, x(t)는, 차량의 현재 위치인 차축의 현재 중심 위치 중 x 좌표의 위치를 의미한다. 또한,

(t)는, 현재 차량의 각도를 의미한다.In Equation (11)

Denotes the position of the x-coordinate among the current center positions of the axle when the rotation center is the origin, and x (t) denotes the position of the x-coordinate of the current center position of the axle, which is the current position of the vehicle. Also,

(t) means the current vehicle angle.

는, 회전 중심을 원점으로 하였을 때의 차축의 현재 중심 위치 중 y 좌표의 위치를 의미하고, y(t)는, 차량의 현재 위치인 차축의 현재 중심 위치 중 y 좌표의 위치를 의미한다. 또한,

(t)는, 현재 차량의 각도를 의미한다.In Equation (12)

Means a position of the y coordinate among the current center positions of the axle when the center of rotation is the origin, and y (t) means the position of the y coordinate of the current center position of the axle, which is the current position of the vehicle. Also,

(t) means the current vehicle angle.

는, 회전 중심을 원점으로 하였을 때의 차축의 이동 후의 중심 위치 중 X 좌표의 위치를 의미하고,

는, 회전 중심을 원점으로 하였을 때의 차축의 이동 후의 중심 위치 중 y 좌표의 위치를 의미한다.In Equation (13)

Means the position of the X coordinate among the center positions after the axle moves when the rotation center is set as the origin,

Means the position of the y coordinate among the center positions after the movement of the axle when the rotation center is the origin.

는, t 시간 동안의 차량 각도의 변화량을 의미하며,

는, 회전 중심을 원점으로 하였을 때의 차축의 현재 중심 위치 중 x 좌표의 위치를 의미하고,

는, 회전 중심을 원점으로 하였을 때의 차축의 현재 중심 위치 중 y 좌표의 위치를 의미한다. Also,

Means a change amount of the vehicle angle during the time t,

Means the position of the x-coordinate among the current center positions of the axle when the rotation center is the origin,

Means the position of the y coordinate of the current center position of the axle when the rotation center is the origin.

만큼 시간이 흐르는 동안 차축이 이동하여, 회전 중심을 원점으로 하였을 때의 이동된 차축의 중심 위치를 산출하는 회전 변환식이다.That is, Equation (13)

And the center of gravity of the moved axle when the center of rotation is the origin is calculated.

는, 차축의 이동 후의 중심 위치 중 X 좌표의 위치를 의미한다. 즉, 절대적인 위치의 값을 의미하는 것이고, 회전 중심을 원점으로 고려하지 않은 상태의 위치이다. 또한, 상기 수학식 14에서

는, 회전 중심을 원점으로 하였을 때의 차축의 이동 후의 중심 위치 중 X 좌표의 위치를 의미하고, x_c(t)는, 회전 중심의 x 좌표의 위치를 의미한다.In Equation (14)

Means the position of the X-coordinate among the center positions after the movement of the axle. That is, it means a value of an absolute position and is a position in a state in which the center of rotation is not considered as the origin. In Equation 14,

Is, the center of the axle after the movement of the center of rotation at the time when the home position means a position of the X coordinate, and x _c (t), the mean position of the x-coordinate of the center of rotation.

는, 차축의 이동 후의 중심 위치 중 y 좌표의 위치를 의미한다. 즉, 절대적인 위치의 값을 의미하는 것이고, 회전 중심을 원점으로 고려하지 않은 상태의 위치이다. In Equation (15)

Means the position of the y coordinate among the center positions after the movement of the axle. That is, it means a value of an absolute position and is a position in a state in which the center of rotation is not considered as the origin.

는, 회전 중심을 원점으로 하였을 때의 차축의 이동 후의 중심 위치 중 y 좌표의 위치를 의미하고, y_c(t)는, 회전 중심의 y 좌표의 위치를 의미한다.Also,

Is, the center of the axle after the movement of the center of rotation at the time when the home position refers to the position of y-coordinate, and y _c (t), the mean position of the y coordinate of the center of rotation.

를 구할 수 있는 최종식이 된다.Equation (16) is obtained by substituting Equations (9) to (13) with respect to Equation (14), and it is assumed that the position of the X-

It becomes the final expression to be able to obtain.

를 구할 수 있는 최종식이 된다.Equation (17) is obtained by substituting Equations (9) to (13) with respect to Equation (15), and is the position of the y coordinate of the center position after movement of the axle

It becomes the final expression to be able to obtain.

As described above, the pulse-based movement position extracting unit 133a can extract the center position of the axle after the movement of the axle using Equations (9) to (17).

3. Second Example

A description will be given of a method of extracting the turn radius and the moved position coordinates of the vehicle 1 according to the second embodiment by utilizing the moving distance of the vehicle 1 extracted from the moving distance extracting unit 131 .

16 is a view for explaining a steering wheel sensor of a vehicle according to a second embodiment of the movement information extracting unit. 17 is a diagram for explaining a method of calculating the rotation angles of the left front wheel and the right front wheel of the vehicle according to the second embodiment of the movement information extracting unit. FIG. 18 is a diagram for explaining a method of extracting a moving position of the vehicle according to the second embodiment of the movement information extracting unit. FIG.

Referring to Fig. 16, the maximum angle of the steering wheel of the vehicle 1 can be confirmed. Specifically, it is possible to rotate in the counterclockwise direction by 535 degrees (that is, -535 degrees) and clockwise by 535 degrees. In order to sense the angle of the steering wheel, a steering wheel sensor located in the vehicle 1 is utilized.

)는 33도이며, 내측 최대 각도(

)는 39도이다. 다만, 차량(1)의 종류 및 기술 발전에 따라 상기 외측 최대 각도 및 내측 최대 각도는 변할 수 있다.
Referring to Fig. 17, the angles of the left front wheel 2 and the right front wheel 2 'of the vehicle can be confirmed. At this time, the outer maximum angle (

) Is 33 degrees, and the inner maximum angle (

) Is 39 degrees. However, the outer maximum angle and the inner maximum angle may vary depending on the type and the technology of the vehicle 1.

The steering-based turning radius extracting unit 132b senses the turning angle of the steering wheel 4 of the vehicle through a steering wheel sensor located on the vehicle 1, and based on the turning angle of the steering wheel 4, And calculates the rotation angle of each of the left front wheel 2 and the right front wheel 2 'of the vehicle 1, thereby extracting the turning radius of the vehicle 1. [

That is, the steering-based turning radius extracting unit 132b detects the angle of the front wheel 2, 2 'of the vehicle 1 based on the detected angle of the steering wheel after detecting the angle of the steering wheel Can be calculated. As a concrete method of calculating the angle of the front wheels 2, 2 'of the vehicle 1, the following equation is used.

는, 회전하는 차량(1)의 전륜 외측의 각도이며,

는, 회전하는 차량(1)의 전륜 내측의 각도이다. 또한,

는, 외측 최대 각도로서 33도이며,

는 내측 최대 각도로서 39도이다.In the above equations (18) and (19)

Is an angle outside the front wheel of the rotating vehicle (1)

Is an angle inside the front wheel of the rotating vehicle (1). Also,

Is 33 degrees as the maximum outside angle,

Is the inner maximum angle of 39 degrees.

Specifically, when the vehicle 1 rotates in the clockwise direction to rotate backward, the angle of the inside of the left front wheel 2 is calculated, and the angle of the outside of the right front wheel 2 'is calculated. When the steering wheel 1 rotates counterclockwise to rotate the steering wheel, the angle of the inside of the right front wheel 2 'is calculated and the angle of the outside of the left front wheel 2 is calculated.

는, 상기 스티어링 센서로부터 획득한 값을 의미하므로 -535도 ~ 535도의 범위를 갖는다.
Also,

Means a value obtained from the steering sensor, and therefore has a range of -535 degrees to 535 degrees.

Referring to FIG. 18, in the base steering-based turning radius extracting unit 132b, the principle of extracting the turning radius of the vehicle can be known.

In addition, the position (the position coordinate of the axle center) 8 of the vehicle before the backward movement and the position (the coordinates of the axle center) 9 of the vehicle after the backward movement are shown. Hereinafter, FIG. 18 and the following equations (20) to (25) will be described in detail.

는, 회전 하는 차량(1)의 전륜 내측의 변화 각도를 의미하고,

는, 회전하는 차량(1)의 전륜 외측의 변화 각도를 의미한다. 18 and in the following equations 20 to 25

Means the angle of change of the inside of the front wheel of the rotating vehicle 1,

Means a change angle of the outside of the front wheel of the rotating vehicle 1.

는, 전륜 차축 중심의 각도를 의미한다.L denotes the distance between the front wheel axle and the rear wheel axle, W denotes the vehicle width, R denotes the turning radius of the axle center,

Means the angle of the center of the front wheel axle.

Further, K means the moving distance of the axle. Here, the moving distance of the axle is the same as the moving distance of the vehicle.

K1 denotes a moving distance of the inner rear wheel, and K2 denotes a moving distance of the outer rear wheel. That is, the moving distance of the axle, which is the moving distance of the vehicle 1, is an average value of the moving distance of the inner rear wheel of the vehicle 1 and the moving distance of the rear wheel of the outer side of the vehicle 1. [

As described above, a concrete method of obtaining the moving distance of the vehicle 1 is omitted because it has been described above in the moving distance calculating section 131. [

Equation (24) summarizes Equation (22) through Equation (23).

The above equation (25) becomes the final formula for extracting the turning radius of the vehicle 1. [ Using the equations (20) to (25), the steering-based turning radius extracting unit 132b can extract the turning radius of the vehicle 1. [

Based on the turning radius extracted from the steering-based turning radius extracting unit 132b and the traveling distance extracted from the traveling distance extracting unit 131, the steering-based traveling position extracting unit 133b calculates the steering- And extracts the moved position. A concrete extraction method will be described using the above-mentioned expressions (16) and (17) and the following expressions (26) and (27).

는, t 시간 동안의 차량 각도의 변화량을 의미하며, R은 차축의 회전 반경이며, K는, 차축의 이동 거리이며, K2는, 외측 후륜의 이동 거리이며, K1은 내측 후륜의 이동거리이다. In the equations (26) and (27)

K is the moving distance of the axle, K2 is the moving distance of the outer rear wheel, and K1 is the moving distance of the inner rear wheel.

를 구할 수 있다.Specifically, the values of K1 and K2 are extracted by the movement distance extracting unit 131, the K value is calculated using the above-mentioned Equation (26), and then the turning radius R extracted by the steering-based turning radius extracting unit 132b Into the above equation (27)

Can be obtained.

를 상기 수학식 16 및 17에

를 대입하게 되면, 차축의 이동 후의 중심 위치를 추출할 수 있게 된다.
therefore,

To the above equations (16) and (17)

The central position after the movement of the axle can be extracted.

Hereinafter, the moving area bird's eye view image generating unit 140 and the bird's-eye view image generating unit 150 will be described with reference to FIG.

The moving area bird's-eye view image generating unit 140 may generate the moving-area bird's-eye view image 140 based on the movement information of the vehicle extracted through the first and second embodiments of the movement information extracting unit 130 Area navigation image that is a bird's-eye view of the area.

Specifically, based on the movement information, a bird's eye view image 45 of the past, which is an image of the bird's-eye bird's-eye view shown in FIG. 4, is generated.

The synthesized bird's-eye-view image generation unit 150 generates a bird's-eye view image 25 after being captured and generated after the previous bird's-eye view image 15 shown in FIG. 4 is generated, 45).

Therefore, the driver can see the bird's-eye image 45 for the portion not captured by the camera unit 110 even when the vehicle is backward and the vehicle exists at the T + 1 time point 1 '.

Hereinafter, the gear-based extraction command unit and the sensor-based extraction command unit will be described with reference to FIGS.

19 is a diagram for explaining a method of extracting a change in the traveling direction of the vehicle by analyzing the pattern change of the wheel pulse with respect to the rear wheel of the vehicle.

20 is a view for explaining a method of extracting a change in the traveling direction of the vehicle by analyzing the pattern change of the wheel pulse with respect to the rear wheel of the vehicle.

If the wheel pulse sensor is designed to sense the direction of travel of the vehicle (directional encoder), it will sense the direction of travel of the vehicle through the wheel pulse sensor, If the driving direction can not be detected, the driving direction of the vehicle is extracted through a gear-based extraction command unit and a sensor-based extraction command unit, which will be described later.

The movement information extracting unit 130 may include a gear-based extracting command unit for confirming the gear state of the vehicle and instructing to extract the movement information of the vehicle when the vehicle is in the reverse state.

The gear status of the vehicle can be confirmed through a sensor or an ECU mounted on the vehicle, and it is known technology, so a detailed description thereof is omitted.

At this time, it is possible to extract the change in the traveling direction of the vehicle by analyzing the pattern change of the wheel pulse with respect to the left rear wheel and the right rear wheel of the vehicle.

Specifically, referring to FIG. 19, a pattern of wheel pulses for the left rear wheel of the vehicle and a pattern of wheel pulses for the right rear wheel of the vehicle before the gear of the vehicle is changed to neutral, 1) the left rear wheel, 2) the right rear wheel, 3) the left rear wheel, and 4) the right rear wheel. At this time, even after the gear of the vehicle becomes neutral, it can be confirmed that the pattern having the sequence of 1) the left rear wheel, 2) the right rear wheel, 3) the left rear wheel, and 4) the right rear wheel are maintained.

Normally, the vehicle is reversed in the reverse gear state, but the vehicle can be reversed even if the gear of the vehicle is not reversed (for example, neutral) depending on the inclination of the ground or the state of the vehicle.

Therefore, if the pattern of the wheel pulse signals for the left rear wheel and the right rear wheel is maintained before and after the gear state of the vehicle is changed to neutral, it is assumed that the traveling direction of the vehicle does not change .

For example, if the vehicle has advanced before the gear of the vehicle has become neutral, it is assumed that the vehicle continues to advance even after the gear of the vehicle becomes neutral, and if the vehicle has been backward before the gear of the vehicle has become neutral , It is estimated that the vehicle continues to be backward even after the gear of the vehicle becomes neutral.

Referring to FIG. 20, a pattern of wheel pulses for the left rear wheel of the vehicle and a pattern of wheel pulses for the right rear wheel of the vehicle before the gears of the vehicle are changed to neutral, Rear wheel, 2) right rear wheel, 3) left rear wheel, and 4) right rear wheel. At this time, it can be seen that after the gear of the vehicle becomes neutral, the pattern is changed to a pattern having the following sequence: 1) right rear wheel 2) left rear wheel 3) right rear wheel 4) left rear wheel.

That is, in order to have the same pattern before the gear of the vehicle becomes neutral and after the gear of the vehicle becomes neutral, the wheel pulse signal (Rising edge) of the left rear wheel is first The wheel pulse signal (Rising edge) of the right rear wheel is detected first.

Therefore, the patterns of the wheel pulse signals for the left rear wheel and the right rear wheel of the vehicle are changed before the gear of the vehicle becomes neutral and after the gear of the vehicle becomes neutral.

As a result, if the pattern of the wheel pulse signals for the left rear wheel and the right rear wheel is changed before and after the gear state of the vehicle is changed to neutral, It is assumed that the traveling direction of the vehicle is changed on the basis of the traveling direction of the vehicle.

For example, if the vehicle has been advanced before the gear of the vehicle has become neutral, it is assumed that the vehicle is backward after the gear of the vehicle has become neutral, and if the vehicle has been backward before the gear of the vehicle has become neutral, It is assumed that the vehicle is advancing after the gear of the vehicle becomes neutral.

Although the description has been made with respect to the rising edge in the analysis of the repeated patterns of the left rear wheel and the right rear wheel, the pattern change may be extracted based on the falling edge.

In addition, the movement information extracting unit 130 determines whether the vehicle is moving backward by sensing gravity and acceleration of the vehicle through a gravity sensor or an acceleration sensor located in the vehicle, and when it is determined that the vehicle is moving backward Based extraction instruction unit that instructs the extraction unit to extract the movement information of the vehicle.

Specifically, the direction of the vehicle 1 is analyzed by comparing a sensed signal and a predetermined signal using a gravity sensor or an acceleration sensor located in the vehicle.

The principle and operation of the gravity sensor or the acceleration sensor is a known technique and should be omitted.

In this case, there is an advantage that it is possible to detect when the vehicle is moving backward even when the vehicle is in the forward gear or the neutral state instead of the reverse gear state.

That is, the sensor-based extraction command unit performs a function of extracting movement information when the vehicle senses a backward movement of the vehicle (1).

Hereinafter, a vehicle peripheral image generating method according to the present invention will be described.

21 is a flowchart of a method of generating a vehicle periphery image according to the present invention.

Referring to FIG. 21, a vehicle peripheral image generating method according to the present invention includes generating a captured image by photographing a periphery through a camera unit located in a vehicle (S100), projecting the captured image to a visual point (S110) of generating a previous bird's-eye view image by converting the data into the data of the left and right wheels of the vehicle, (S120) of extracting movement information of the vehicle based on the wheel pulse, generating a moving area bird's eye view image that is a bird's-eye view of the area where the vehicle has moved by corresponding to the movement information ) And a bird's-eye image that has been captured and generated after the previous bird's-eye image has been generated, And generating a synthesized bird's-eye view image by synthesizing the synthesized bird's-eye view image with a region bird's-eye view image (S140).

In this case, after the step (S140) of generating the composite bird's-eye view image, the step (S 150) of displaying the composite bird's eye view image through the display unit located in the vehicle may be further included.

The vehicle periphery image generation method according to the present invention is omitted in the same parts as those of the vehicle periphery image generation apparatus 100 described above.

Hereinafter, an embodiment of the step of instructing to extract the movement information of the vehicle in the vehicle periphery image generation method according to the present invention will be described with reference to FIG.

Referring to FIG. 22, step S112 is followed by step S110 to determine whether the gear of the vehicle is in a reverse state. The gear status of the vehicle can be confirmed through a sensor or an ECU mounted on the vehicle, and it is known technology, so a detailed description thereof is omitted.

At this time, if it is determined in step S112 that the gear state is reverse, step S118 is executed to extract the vehicle movement information, and the movement information is extracted in step S120.

However, if it is determined in step S112 that the gear state is not a reverse state (for example, forward or neutral), step S114 is performed to determine whether the vehicle is moving backward.

At this time, in order to determine whether the vehicle is moving backward, a pattern change of a wheel pulse or a gravity sensor and an acceleration sensor located in the vehicle may be utilized as described above.

Here, when it is determined that the vehicle is moving backward (that is, the gear state is not the reverse state but the vehicle is moving backward), the operation proceeds to step S118, where it is instructed to extract the movement information of the vehicle. Accordingly, the moving information is extracted in step S120.

However, if it is determined in step S114 that the vehicle is not moving backward, step S116 of erasing the image outside the visual field proceeds. That is, since the vehicle is moving forward, an image outside the view of the camera unit located in the vehicle does not need to be displayed.

As described above, the apparatus and method for generating a peripheral image of a vehicle according to the present invention are not limited to the configurations and methods of the embodiments described above, All or a part of the above-described elements may be selectively combined.

1: vehicle
2: front wheel 3: rear wheel
4: Steering wheel 5: Shooting image
100: vehicle peripheral image generating device
110: camera unit 120: bird's-eye view image generating unit
130: movement information extracting unit 140: moving region bird's-eye view image generating unit
150: Composite bird's-eye view image generating unit 160:

Claims (18)

An apparatus for generating an image around a vehicle on the basis of an image photographed by a camera unit located at the rear of the vehicle and photographing the rear of the vehicle,
A bird's-eye view image generating unit for generating a bird's-eye view image by converting the shot image into data of a ground coordinate system projected to a visual point of the camera unit;
A movement information extracting unit for extracting movement information of the vehicle on the basis of wheel pulses for the left and right wheels of the vehicle, which are generated in correspondence with the wheel rotation amounts of the vehicle through a wheel pulse sensor located in the vehicle;
A moving area bird's-eye view image generating unit for generating a moving area bird's eye view image, which is a bird's-eye view of the area where the vehicle has moved, by associating the previous bird's-eye view image generated by the bird's-eye view image generating unit with the movement information; And
A composite bird's-eye view image that generates a composite bird's-eye view image including the surrounding images for the front, rear, and sides of the vehicle by combining the bird's-eye view image captured and generated after the previous bird's-eye view image is generated with the moving- Comprising:
Wherein the movement information extracting unit extracts a change in the traveling direction of the vehicle by analyzing a pattern change of a wheel pulse with respect to the left wheel and the right wheel when the gear state of the vehicle is changed to a neutral state,
Wherein the movement information extracting unit determines that the traveling direction of the vehicle is changed when the pattern of the wheel pulse before the gear state is in the neutral state and the wheel pulse pattern after the gear state is in the neutral state are different from each other An apparatus for generating an image around a vehicle. The method according to claim 1,
The movement information extracting unit extracts,
And a moving distance extracting unit for extracting a moving distance of the vehicle based on a wheel pulse for the left wheel and an average of wheel pulses for the right wheel. The method of claim 2,
The movement information extracting unit extracts,
And a pulse-based turning radius extracting unit for extracting a turning radius of the vehicle based on a difference between wheel pulses of the left wheel and the right wheel. The method of claim 3,
The movement information extracting unit extracts,
Based on the rotation radius extracted from the pulse-based rotation radius extraction unit and the movement distance extracted from the movement distance extraction unit, the pulse-based movement position extraction unit extracts a position where the vehicle has moved, Image generating device. The method of claim 2,
The movement information extracting unit extracts,
Detecting a steering rotation angle of the vehicle through a steering wheel sensor located in the vehicle and calculating a rotation angle of each of a left front wheel and a right front wheel of the vehicle on the basis of the steering rotation angle, And a steering-based turning radius extracting unit. The method of claim 5,
The movement information extracting unit extracts,
Based on the turning radius extracted from the steering-based turning radius extracting unit and the traveling distance extracted from the traveling distance extracting unit, the steering-based traveling position extracting unit extracts a position where the vehicle has moved. Image generating device. The method according to claim 1,
The movement information extracting unit extracts,
And a gear-based extraction command unit for confirming a gear state of the vehicle and instructing to extract movement information of the vehicle when the vehicle is in a reverse state. delete The method according to claim 1,
Wherein the change of the traveling direction of the vehicle is extracted by analyzing changes of a pattern of a rising edge or a falling edge of repeated wheel pulses between the left wheel and the right wheel. A method for generating an image around a vehicle on the basis of a captured image generated from a camera unit located behind the vehicle and photographing the rear of the vehicle.
Generating a previous bird's-eye view image by converting the captured image into data of a ground coordinate system projected to a visual point by the bird's-eye view image generating unit;
The movement information extracting unit extracts the movement information of the vehicle based on the wheel pulses for the left and right wheels of the vehicle, which are generated corresponding to the wheel rotation amounts of the vehicle through the wheel pulse sensors located in the vehicle ;
Generating a moving area bird's eye view image, which is a bird's-eye view of the area in which the vehicle has moved, by associating the previous bird's-eye view image with the moving information by a moving area bird's-eye view image generating unit; And
The synthesized bird's-eye view image generating unit synthesizes the bird's-eye view image after the previous bird's-eye view image is generated and generated after the generation of the previous bird's-eye view image with the moving area bird's-eye view image, thereby synthesizing the surrounding images for the front, Generating a bird's-eye image,
The step of extracting the movement information of the vehicle includes:
Extracting a change in a traveling direction of the vehicle by analyzing a pattern change of a wheel pulse with respect to the left wheel and the right wheel when the gear state of the vehicle is changed to a neutral state; And
And determining that the traveling direction of the vehicle is changed when the pattern of the wheel pulse before the gear state is in the neutral state and the pattern of the wheel pulse after the gear state is in the neutral state are different from each other How to create an ambient image. The method of claim 10,
Wherein the step of extracting the movement information comprises:
And extracting a moving distance of the vehicle based on a wheel pulse for the left wheel and an average of wheel pulses for the right wheel. The method of claim 11,
Wherein the step of extracting the movement information comprises:
And extracting a turning radius of the vehicle based on a difference of wheel pulses between the left wheel and the right wheel. The method of claim 12,
Wherein the step of extracting the movement information comprises:
And extracting a position where the vehicle has moved based on the extracted turning radius and the moving distance extracted in the extracting of the moving distance in the step of extracting the turning radius, Way. The method of claim 11,
Wherein the step of extracting the movement information comprises:
Detecting a steering rotation angle of the vehicle through a steering wheel sensor located in the vehicle and calculating a rotation angle of each of a left front wheel and a right front wheel of the vehicle on the basis of the steering rotation angle, The method comprising the steps of: 15. The method of claim 14,
Wherein the step of extracting the movement information comprises:
And extracting a position where the vehicle has moved based on the extracted turning radius and the moving distance extracted in the extracting of the moving distance in the step of extracting the turning radius, Way. The method of claim 10,
After generating the previous bird's-eye image,
Further comprising the step of: confirming a gear state of the vehicle and instructing to extract movement information of the vehicle when the vehicle is in a reverse state. delete The method of claim 10,
Wherein a change in a traveling direction of the vehicle is extracted by analyzing a change in a pattern of a rising edge or a falling edge of a repeated wheel pulse between the left wheel and the right wheel.

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